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Calibration of GA1550 biotite standard for K/Ar and 40 Ar/ 39 Ar dating

McDougall, Ian; Wellman, Peter


The mineral separate GA1550 biotite has become an international standard for K/Ar and 40Ar/39Ar dating studies, although it was prepared as an intralaboratory standard at ANU to monitor tracer depletion from a gas pipette. It is one of a small number of samples that has been calibrated against 38Ar tracers, some of which had been mixed with known amounts of atmospheric argon, so that a so-called primary calibration has been performed. By measuring GA1550 biotite against additional tracers from...[Show more]

CollectionsANU Research Publications
Date published: 2011
Type: Journal article
Source: Chemical Geology
DOI: 10.1016/j.chemgeo.2010.10.001


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